Roman Catechism 39.44

Chapter 39 — Part IV: Prayer — The Fifth Petition: Forgive Us Our Trespasses as We Forgive Those Who Trespass Against Us

Section 44. Secondly, when we ask this favour from God, we also ask for whatever cooperation with the Petition is necessary on our part in order to obtain the object of our prayer. Thus we ask the pardon of our sins and the gift of true repentance; we pray for the grace of inward sorrow; we beg that we may be able to abhor our sins, and confess them truly and piously to the priest. Since, then, it is necessary for us to forgive those who have inflicted on us any loss or injury, when we ask pardon of God we beg of Him at the same time to grant us grace to be reconciled to those against whom we harbour hatred.